IFF you feel like peeking behind the curtain...
erreur : object b7550f84d72a158e20aa425ea2a8f24b9ee9bac0: badDateOverflow: invalid author/committer line - date causes integer overflow
[...]
% git show b7550f84d72a158e20aa425ea2a8f24b9ee9bac0)
commit b7550f84d72a158e20aa425ea2a8f24b9ee9bac0
Author: Omar Antolín Camarena <omar.antolin@gmail.com>
Date: Thu Jan 1 00:00:00 1970 +0000
When deciding if a candidate is selected compare original targets
These files are actually pretty simple, stored in .git/objects/<commit-ID>, very close to how it's printed by git show. There should be lines starting with Author or Committer, followed by the name & email, then a unix timestamp. Presumably, those unix timestamps are, to use a technical term, "wack".
I don't know git well enough to know how dangerous it would be to fix up that file on Savannah, but it might help debug, at least.
Hope that helps,
~Chad